Gotta be “Wood”. I’ve found sites with properties of wood, but have to hunt and peck for first-hand accounts and pictures of examples before and after working it. Nothing seems to be more complicated than identifying a piece of wood, even by experts, and particulary in old furniture and carvings. The more learned about different woods, how to use them to best advantage, where to get them, what’s a fair price, and what is involved in working them, the more people will branch out and experiment. It wouldn’t hurt to have the know-how, too, to avoid costly mistakes. If it’s called “Materials” you’ll have to wade through numerous posts on glues, hardware, and everything else. Even “Wood” could be broken down into sub-catagories, but a search engine would let a person type in what they are looking for and pick it out of all the blogs.